#include <iostream>
#include <initializer_list>
using namespace std;

class Circle
{
public:
    Circle() : Pi(3.14), x(5), y(x * 6.1) { cout << "Pi: " << Pi << endl; }
    // Circle(std::initializer_list<double> list) {}
    // 错误：Circle() { Pi = 3.14; }
private:
    const double Pi;
    int x;
    float y;
};

int main()
{
    Circle c;
    return 0;
}